Protected insulator.



J. H. MOCK.

PROTECTEDJNSULATOR.

APPLICATION FILED FEB. B. 1915.

Patented Mar. 21, 1916.

JOHN H. MOCK, 0F JETMORE, KANSAS.

PROTECTED INSULATOR.

Specification of Letters Patent.

Patented Mar. 21, 1916.

Application filed February a, 1915. Serial No. 6,787.

To all whom it may concern:

Be it known that I, JOHN H. MOCK, a citizen of the United States, residing at J etmore, in the county of Horgeman and State of Kansas, have invented certain new and useful Improvements in Protected Insulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to new and useful improvements in insulators and housings therefor and more particularly to that class adapted for use in connection with telephone or telegraph wires.

My, object is to provide an insulator, parts of which will grip the wire and hold the same against longitudinal movement.

A further object is to provide a housing for the insulator which will practically entirely surround the insulator.

A further object is to arrange parts of the housing for locking the sections of the insulator together and forcing the same in firm engagement with the wire.

A further object is to provide means for securing the housing to the usual form of cross arm or pole.

Other objects and advantages will be here inafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawings which are made a part of this application, Figure 1 is a side elevation of my device as applied to use in connection with the cross arm, Fig. 2 is a vertical, central, sectional view thereof, Fig. 3 is a similar view taken at right angles to that shown in Fig. 2, Fig. 4 is a detail sectional view of a slightly modified form of housing, and Fig. 5 is a detail side elevation of a still further modified form.

Referring to the drawings, in which similar reference numerals designate corresponding parts throughout the several views, 1 indicates the insulator which is preferably constructed of glass or porcelain and is formed in two sections 2 and 3, the section 3 being preferably substantially sectoral in cross section and extends into a substantially shaped cavity 4 in the section 2. The insulator 1 is preferably globular in general outline, and has extending transversely therethrough a bore 4, that portion of the section 2 at the longitudinal center of the bore 5 of the insulator being provided with the depression 6,. while the edge of the section 3 at this point is provided with an extension 7, which when the two sections are properly seated together will force the wire 8 into the depression and form a crimp therein, thus holding the wire firmly against longitudinal movement through the insulator.

The bore 5 flares outwardly in each direction from the axial center of the insulator, and the ends thereof are carried beyond the face of the insulator by providing knobs 9 at each end of the bore, said knobs being reinforced by means of circumferential ribs 10, thus leaving the neck 11 of less diameter than the outer ends of the knobs.

In order to protect the insulator against destruction and also to strengthen the same and provide means for readily attaching the insulator to cross arms, poles or the like, I provide a metal housing 12 having a cupshaped opening 13 to receive the ball portion of the insulator, the wall of the housing having slots 14 therein through which extend the knobs 9, the slots being so arranged as to engage the reduced neck portion of the knobs whereby only the extreme ends of the knobs will be exposed. The upper end of the housing 12 is threaded on its exterior to engage with threads of the depending flange 15 of a locking cap 16, said cap having a concave cavity 17 in its inner face which cooperates with the curved surface of the section 3, and when the cap is turned onto the housing it causes the extension 7 to force the wire into the depression 6 and positively lock the same therein. The upper face of the locking cap 16 is preferably provided with an integral shouldered section 18 so that a wrench or the like may be applied thereto to secure the cap to the housing or remove the same therefrom.

At the lower end of the housing 12 is provlded Jan integral shouldered section 19, from which projects a screw threaded stem 20 by means of which the housing is secured to the cross arm 21 or to any other suitable object. 2

In Fig. 4 of the drawings, instead of providing a stem in connection with the shouldcred section. 19, an interiorly threaded socket 22 is provided whereby the housing is adapted to he engaged with the threaded posts 23, now commonly used in connection drawings, a curved extension 24 is provided for the lower end of the housing so as to extend the shouldered section 25 and the screw threaded stem 26 at right angles to the vertical axis of the housing, thus adapting the housing to be secured direct to a pole or other device, and dispensing with the usual form of cross arm.

In providing the metallic housing for the insulator, I have not only protected the same against being destroyed from various sources, but the housing will greatly reinforce the insulator and will hold the parts from coming apart should they in any manner become broken. It will also be seen that should the wire break between any two insulators, the remainder of the wire will be held taut, in view of the interlocking parts of the insulator and by increasing the diameter of the bore 5 from its longitudinal center to its outer ends, thus forming a funnel shaped cavity, the wire will be protected against injury by the galvanized covering thereon being destroyed, as when lightning strikes the wires and encounters the insulator. It will also be seen that in view of the small amount of the insulator which is exposed, a rifle ball, when fired thereagainst, will not materially injure or break the insulator, and even though the exposed portion of the knob was destroyed, the wire would still be held out of engagement with the metal portion of the housing in view of the flare of the bore through which the wire extends.

What I claim is The combination with an insulator havmg a transverse opening therethrough to receive a wire, the body of said insulator being globular, the outer ends of the transverse opening being surrounded by projecting knobs, each knob having a rib, said rib forming a neck, said insulator having a depression at the longitudinal center of the opening and a substantially V-shape section having an extension adapted to engage and force the wire into said depression to form a crimp therein, the trend of the depressed portlon of the wire being parallel to the trend of the remaining portion, the bends in the wire at each end of the depressed portion being abrupt, of a substantially cup-shape member to receive said insulator, said cup-shape member having vertical slots extending downwardly from its upper edge to snugly receive the neck portions of the insulator, a threaded locking cap adapted to cooperate with the cupshape member to force the V-shape section downwardly, said cap having a concave cavity at its center to I'GCBiWi the contiguous part of the V-shape member.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN H. MOCK.

Witnesses:

S. G. DOUGHETY, J. T. SMITH. 

